Which of the following forms a sphere around the sun?

What does "the following" mean ?
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The Oört Cloud and the Kuiper Belt both form
spheres around the Sun.

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.